A 1929 article by Professor Th. Abt explaining how to measure output and operating efficiency in a weaving mill before attempting to reorganize production. Using a worked example of a cretonne mill with 500 power looms, it shows how to calculate theoretical output from average loom speed and picks per centimetre, then percentage of output and operating efficiency allowing for idle looms. It includes a 26-payday table and a graph of the two curves, with causes of dips such as influenza, cold weather affecting conditioning, and poor warp yarn.